Improvement in the combustion of fuel in steam-boiler furnaces



G. W. MORRISON. Combustion of'Tuel in Steam-Bol'er Furnaoem No. 20-3,485. Patented'Ma 7,1878.

'boiler furnace and flue, with my improve- 4 the fiues that the air which passes through it UNITED STATES PATENT OFFICE.

GEORGE W. MORRISON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELF, HENRY G. CAREY, ABRAM HART, AND'ELIZABETH BICH, AD-

MINISTRATRIX, OF SAME PLACE.

IMPROVEMENT lN THE COMBUSTION OF FUEL IN STEAM-BOILER FURNACES.

Specification forming part of Letters Patent No. 203,4S5, dated May 7, 1878 application filed 4 January '7, 1878.

To all whom it may concrn:

Be it known that I, GEORGE W. MORRISON, of Philadelphia, Pennsylvania, have invented new and useful Improvements'in the Oombustion of Fuel in Steam -Boiler Furnaces, of which the following is a specification:

The object of my invention is the efi`ectua1 and economical burning of coal in stcamboiler furnaces; and this object I attain in the manner which I will now proceed to describe, reference being had to the acconpanying drawing, in which- Figure 1 is a perspective View of a stcamnents; Fig. 2, a vertical section of the same, and Fig. 3 a transverse section of part of the furnace. y

A andA' are the opposite side walls of the furnace; D, the front wall; E, the rear wall; B, the fire-place; C, the grate; H, the bridgewall; I, the fine at the rear of the same; a, the doorway for the introduction of fuel into the fire-place, and b b theash-pit openings, both doorway and openings being furnished with suitable doors.

On the top of the bridge, or near the same, is a transverse pipe, G, having a number of pei'forations, preferably on the upper. side only, and with this pipe communicates a horizontal pipe, L, contained in the flue at the rear of the bridge, and passing through the rear wall E. Into this pipe L projects a tube, M, which traverses the flues at the rear of the bridge, its outer end being open to the atmosphere. The -course of this tube will depend, in a great measure, upon the character of the flues; but it should be arranged in such a circuitous or zigzag course within or near will be thoroughly heated.

Within the pipe L is a nozzle, h, to which superheated steam is conveyed by a pipe, i. This nozzle projects into a second nozzle, so secured to the interior of the pipe L that air can pass freely between this second nozzle and the interior of the said pipe, which must be larger in diameter, owing to the presence in it of the two nozzles, than the pipe M. The forcible jet of superheated steam ejected fron this` nozzle will induce air to enter the pipe M, and in its rapid course through the latter the air will be thoroughly heated before it reaches the steam-jet, with which it will be combined, the mixture of heated air and dry steam passing through the perforations of the pipe G in forcible jets, and being intimately comningled with the products of conbustion asthey pass from the fire-place, so that the uriconsumed gases of these products will be ignited, and a resultant flame of intense heat will pass through the flues.

The invention can be applied to any stcamboiler furnace without any change of the fire-- grate bars or alteration in the settings.

In burning anthracite coal, I prefer to employ a blast beneath the grate, this blast being created by a jet of steam ejected from a nozzle, w, in a bent pipe, N, which passes through the wall of the fire-place beneath the grate, the jet of steam causing air to pass through the said pipe N into the ash-pit with v a force and in a Volume depending upon the size of the jet, the small steampipe bein g furnished with suitable cocks, by which the force of the stean-jets may be regulated.

I do not desire to claim, broadly, the discharge into the products of combustion in steam-boler furnaces of jets of combined air and steam; nor do I claim, broadly, the discharging of combined heated air and superheated steam into the products of combustion at the rear of the furnace; but

I claim as my invention- The conbnaton, with a steam-b'oiler furnace, of the air-heating tube M, arranged in the flue, a pipe, L, receiving air from the said tube M, a nozzle in the pipe L, a nozzle, 1

projecting into the first nozzle and communioating with a stcam-pipe, and a perforated` distributing-pipe, G, with which the said pipe L communicates, and from which jets of combined air and steam are projected, all as set forth.

In testimony whereof I have signed my I name to this specification in the presence oi' two subscribing witnesses.

i GEORGE W. MORRISON.

" Witnesses:

HARRY A. CRAWFORD, HARRY Smcrn. 

